diff --git a/attributes_debug.go b/attributes_debug.go
index 7bf09af..d7bb703 100644
--- a/attributes_debug.go
+++ b/attributes_debug.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package stun
diff --git a/attributes_debug_test.go b/attributes_debug_test.go
index 9e03303..e7c3306 100644
--- a/attributes_debug_test.go
+++ b/attributes_debug_test.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package stun
diff --git a/checks_debug.go b/checks_debug.go
index 955f555..543ddcb 100644
--- a/checks_debug.go
+++ b/checks_debug.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package stun
diff --git a/fingerprint_debug.go b/fingerprint_debug.go
index 6da074c..968bee8 100644
--- a/fingerprint_debug.go
+++ b/fingerprint_debug.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package stun
diff --git a/integrity_debug.go b/integrity_debug.go
index 6b8a303..0ea511f 100644
--- a/integrity_debug.go
+++ b/integrity_debug.go
@@ -1,3 +1,4 @@
+//go:build debug
 // +build debug
 
 package stun